Kawasaki FR651V-LS00-S 21HP V-Twin Vertical Shaft Engine Electric Start

Reliability is the top priority in the Kawasaki FR651V engine, ideal for residential use. Smooth operation contributes to quieter performance while commercial-grade power helps provide the type of results you’ll want to replicate time and time again. Make at-home outdoor maintenance something to look forward to with this efficient V-twin, 4-cycle vertical shaft engine.

Features:

Engine performance, by the numbers.

• From power and torque numbers to engine features and more, the following is here to help communicate engine performance details and capabilities. Be sure to consider these specs to help ensure the engine you’re choosing is a match to your mowing needs.

Overhead V-valve

• This 726cc V-Twin utilizes a vertical Overhead Valve (OHV) configuration to achieve superior volumetric efficiency. The V-valve placement allows for a compact, high-compression combustion chamber that enhances power output while facilitating rapid heat dissipation. This architectural choice ensures the FR651V maintains its 21HP rating even under heavy loads and high ambient temperatures.

90° V-twin

• Enjoy a smoother ride with the 90° V-Twin engine architecture. This precision-balanced geometry naturally cancels out internal vibrations, protecting your mower’s deck and frame from mechanical stress. It provides a steady, refined 21HP power delivery that reduces operator fatigue, making those long weekend mows feel effortless.

Pressurized lubrication system

• Give your engine the same protection found in commercial machinery. The FR651V uses a dedicated oil pump to force clean, filtered oil directly to critical internal bearings. Unlike basic splash-style engines, this pressurized system ensures total lubrication and cooling even when mowing on inclines or uneven terrain, keeping your 21HP investment running like new for years.

Electronic spark ignition

• Experience the confidence of dependable "first-turn" starting with a high-output electronic spark ignition system. Designed for total reliability, this system delivers a powerful, consistent spark in all weather conditions—from cold spring mornings to the peak heat of summer. It eliminates the frustration of difficult starts and requires zero maintenance, ensuring your 21HP V-Twin is always ready when you are.

Automatic compression release

• Take the stress out of starting with the Automatic Compression Release (ACR) system. This intelligent feature momentarily reduces cylinder pressure during the cranking cycle, allowing the engine to turn over with minimal resistance. It ensures a fast, dependable start every time while significantly extending the life of your battery and starter motor by reducing electrical strain.

Internally vented carburetor with fuel shut-off solenoid

• Maintain consistent 21HP power even in dusty mowing environments with the internally vented carburetor. This system automatically balances air pressure to ensure the perfect fuel-to-air ratio, preventing the engine from "choking" as the air filter collects debris. Additionally, the integrated fuel shut-off solenoid provides a clean, quiet shutdown by instantly stopping fuel flow at the source, eliminating the loud backfires common in older engines.

Rotating metal grass chopper screen

• Protect your engine from overheating with the heavy-duty rotating metal grass chopper screen. This active system doesn't just block grass and leaves it pulverizes them on contact. By shredding debris before it can enter the cooling system, it ensures a constant, high-velocity flow of air to the cylinders, keeping your 21HP engine running at peak performance even in the thickest, driest conditions.

Cast-iron cylinder liners

• Invest in an engine built for the long haul. The FR651V features heavy-duty cast-iron cylinder liners that provide a rugged, wear-resistant surface for the pistons. This commercial-grade construction withstands extreme heat and high-stress operation far better than aluminum alone, ensuring your 21HP engine maintains maximum compression and power for years to come.

Single-stage air filter

• The FR651V features a precision-engineered single-stage air cleaner designed to maximize volumetric efficiency. This high-velocity intake system allows the 726cc engine to breathe freely, maintaining steady 21HP output even during long duty cycles. The high-density filter media provides a reliable barrier against airborne contaminants, protecting internal components while offering tool-free serviceability.